HTMA vs DUTCH vs GI-MAP for Acne: Which Test Do You Need? | KSW Blog

HTMA, DUTCH, and GI-MAP are three of the most common functional lab tests used for acne, and they measure completely different systems. HTMA looks at mineral and heavy metal patterns through hair, DUTCH looks at sex and adrenal hormones through urine, and GI-MAP looks at gut bacteria, yeast, and parasites through stool. The right one depends on which symptoms are actually driving your breakouts, not which test is trending.

I get some version of this question almost every week: “Which test should I run first?” Usually it comes from someone who has already spent money on the wrong one.

That’s the real cost of guessing with functional labs. They’re not cheap, and ordering the wrong one first doesn’t just waste money; it can send you down a treatment path that has nothing to do with why you’re actually breaking out. This post breaks down what each of these three tests actually measures, what kind of acne pattern each one is built to investigate, and how to figure out which one matches your specific case before you spend a dollar.

What Is HTMA Testing, and What Does It Show About Acne? acne testing

Hair Tissue Mineral Analysis (HTMA) uses a small hair sample to measure mineral levels and heavy metal accumulation in the body. Because hair grows slowly and stores minerals as it forms, HTMA gives a longer window into mineral status than a single blood draw, typically reflecting patterns over the past two to four months rather than a same-day snapshot.

For acne specifically, HTMA is useful when the picture points toward mineral imbalance rather than hormones or gut symptoms: things like chronic fatigue alongside breakouts, copper-zinc imbalances (which show up more often than people expect in stubborn adult acne), sluggish thyroid-adrenal patterns, or a history of heavy metal exposure. It measures ratios like calcium-to-magnesium and sodium-to-potassium, which can flag stress patterns in the adrenal system long before those patterns show up on standard bloodwork.

What Is DUTCH Testing, and What Does It Show About Acne?

The DUTCH test (Dried Urine Test for Comprehensive Hormones) measures sex hormones, estrogen, progesterone, and testosterone, along with adrenal hormones like cortisol and DHEA, plus how your body is metabolizing and clearing those hormones. It’s run from dried urine samples collected at home, usually across a single day or, for the DUTCH Cycle Mapping version, across a full cycle.

This is the test that answers the question “is this hormonal acne?” with actual data instead of a guess. It’s built for jawline and chin breakouts that flare around ovulation or the days before a period, cystic acne that doesn’t respond to topical treatment, signs of estrogen dominance, or symptoms of chronically elevated cortisol- think acne that gets dramatically worse during high-stress weeks. DUTCH also looks at androgen metabolism pathways, which matters because the way your body breaks down testosterone (not just how much you produce) has a direct relationship with oil production and breakout severity.

What Is GI-MAP Testing, and What Does It Show About Acne?

GI-MAP (GI Microbial Assay Plus) is a stool test that uses quantitative PCR technology to identify and measure bacteria, parasites, yeast, and H. pylori in the gut, along with markers for inflammation, digestion, and gut barrier function (leaky gut). Because it uses quantitative PCR rather than older culture-based methods, it can detect organisms that standard stool cultures often miss, and it reports how much of each organism is present rather than a simple positive or negative.

This is the test to reach for when digestive symptoms are part of the picture, bloating, irregular bowel movements, food reactions, or a history of antibiotic use that never quite resolved. There’s a growing body of research on the gut-skin axis, the mechanism by which gut bacteria influence systemic inflammation and, in turn, skin health, and a 2025 review in Dermatology Research and Practice noted that while the mechanistic case is well established, gut dysbiosis has also been observed alongside acne in preliminary clinical studies. GI-MAP won’t tell you anything about your hormones or your mineral status — it’s built specifically for what’s happening in your gut.

HTMA vs DUTCH vs GI-MAP: Side-by-Side Comparison acne testing

	HTMA	DUTCH	GI-MAP
Sample type	Hair	Dried urine	Stool
What it measures	Minerals, heavy metals, mineral ratios	Sex hormones, adrenal hormones, cortisol pattern	Gut bacteria, yeast, parasites, H. pylori, inflammation markers
Time window shown	2–4 months (long-term pattern)	Single day (or full cycle with Cycle Mapping)	Snapshot of current gut microbial population
Best-fit acne pattern	Fatigue + breakouts, copper-zinc imbalance, sluggish thyroid/adrenal signs	Cyclical, jawline/chin, cystic, stress-reactive acne	Acne with bloating, irregular digestion, post-antibiotic history
Does it test hormones?	No	Yes — full sex + adrenal panel	No
Does it test gut health?	No (indirectly, via mineral ratios only)	Only via organic acid add-ons	Yes — this is its primary function
Collection method	Small hair clipping	At-home urine strips	At-home stool sample

Which Test Do You Actually Need? A Decision Guide

Our general recommendation: start with HTMA. Minerals and heavy metals sit underneath almost everything else; hormone production, thyroid and adrenal function, and gut lining integrity all depend on having the right mineral ratios in place. HTMA is also the least invasive and most affordable of the three, which makes it the lowest-risk place to start no matter what your acne pattern looks like. Once you have that baseline, you’ll know whether to stop there or move on to a more targeted test.

From there, your symptom pattern points to what to add next:

Your acne is cyclical, worse around your period, or jawline/chin-focused → Add DUTCH next. This is the test that directly measures the hormones driving that pattern.
Your acne comes with bloating, irregular bowel movements, or started after a round of antibiotics → Add GI-MAP next. Hormonal testing won’t catch a gut issue that’s already visible in your digestion.
Your acne is paired with fatigue, brain fog, or a “my labs are normal but I still feel off” pattern with no clear hormonal or digestive trigger → HTMA alone is often enough to explain it. Mineral imbalances are frequently the piece standard bloodwork misses entirely.
You genuinely can’t tell which category you fall into → Don’t guess. Take the Functional Lab Quiz — it walks through your specific symptoms and confirms whether HTMA alone is enough or whether you should pair it with DUTCH or GI-MAP.

One important note: these tests aren’t mutually exclusive, and most people eventually run more than one. The goal isn’t to pick the “best” test — it’s to start with the test that gives you the clearest foundation, so any test you add after that is answering a specific question instead of a guess.

Getting Started With Functional Lab Testing

Track your pattern for two weeks before ordering anything. Note where breakouts show up, whether they track with your cycle, and what digestive or energy symptoms show up alongside them.
Take the Functional Lab Quiz to confirm which category your symptoms fall into before spending money.
Order the single most relevant test first — not all three at once. You’ll get clearer, more actionable data from one well-matched test than from three tests you don’t know how to interpret together.
Work the results with someone who reads these regularly. Reference ranges on these panels are wide, and the clinically meaningful patterns are often in the ratios and combinations, not a single flagged number.

Related Listening

Two Keep It Clear episodes go deeper on this topic:

🎧 HTMA & Hair Mineral Testing for Clear Skin — a full breakdown of how mineral testing connects to stubborn, unexplained acne.
🎧 The Right Way to Test for Acne Root Causes — how to sequence functional testing so you’re not guessing (or overspending).

Ready to Order? Here’s Where to Start

If your symptoms point toward mineral imbalance, fatigue, or a stubborn pattern standard labs haven’t explained:

Get the HTMA Testing Package →

If your symptoms point toward cyclical, jawline/chin, or stress-reactive acne:

Get the DUTCH Testing Package →

If your symptoms point toward bloating, irregular digestion, or acne that’s never resolved since antibiotics:

Get the GI-MAP Testing Package →

Still not sure which fits? Take the quiz first — it takes less time than reading the rest of this post.

FAQ

Can I just order all three tests at once? You can, but it’s rarely the most useful starting point. Each test comes with its own reference ranges and interpretation nuances, and running all three before you understand any one of them usually creates more confusion, not less. Start with the test that matches your dominant symptom pattern, then expand from there if needed.
Is HTMA accurate, or is it “pseudoscience”? HTMA is a legitimate, established method for measuring long-term mineral and heavy metal accumulation, and it’s been used in clinical and research settings for decades. Its limitation is scope, not accuracy — it measures minerals and metals only, not hormones, vitamins, or gut pathogens, so it needs to be matched to the right symptom pattern.
Do I need a practitioner to order DUTCH, HTMA, or GI-MAP? All three are available as direct-to-consumer functional lab tests, but interpreting the results — especially ratios, metabolite pathways, and clinically relevant thresholds — is where the real value is. Ordering without a plan to interpret and act on the results is the most common way people waste money on functional testing.
How long does it take to get results back? Turnaround varies by lab, but most HTMA, DUTCH, and GI-MAP panels return results in three to four weeks from the day your sample is received.
Will insurance cover these tests? Sometimes! These are functional/direct-to-consumer panels rather than standard diagnostic labs, so they’re covered under nutrition counseling if you order through a licensed practitioner like us, and some HSA/FSA plans do cover them.
What if my results don’t clearly point to one root cause? This is common, especially with acne that’s been going on for years. Layered patterns (a mineral imbalance and a hormonal pattern, for example) do happen, which is exactly why starting with the test that matches your most dominant symptom, rather than all three, gives you a clearer first step to act on.